Refurbished lifter bar

Abstract

In a method of making a lifter bar for use in a grinding mill, a refurbished lifter bar and a mould for producing the refurbished lifter bar, the lifter bar has a predetermined form and has a base member, and the method includes providing a mould having an interior space that conforms at least partially to the predetermined form, joining the mould and the base member together to form a cavity defined by the base member and the interior space, and filling the cavity with polymer and allowing the polymer to attach to the base member to construct a lifter bar having the predetermined form.

The invention claimed is: 
     
       1. A refurbished lifter bar for use in a grinding mill, the refurbished lifter bar having a predetermined form and comprising:
 a base member, said base member comprising a worn lifter bar or a part of a worn lifter bar and having a different form than the predetermined form; and 
 a new wearing surface, wherein the new wearing surface is formed of polyurethane by moulding to the base member to form the refurbished lifter bar having the predetermined form, 
 wherein the new polyurethane wearing surface comprises at least part of an outer side surface of the lifter bar, which is toward the moving direction of the grinding mill, and at least part of an outer top surface of the refurbished lifter bar, which is opposite the base member, 
 wherein the refurbished lifter bar is configured to be connected to the grinding mill by the base member, and 
 wherein the refurbished lifter bar comprises a contact surface through which the base member and the new wearing surface are chemically bonded together to form the refurbished lifter bar, the contact surface including a worn wearing surface of the base member which is roughened and/or chemically treated. 
 
     
     
       2. The refurbished lifter bar according to  claim 1 , wherein the polyurethane comprises additives. 
     
     
       3. The refurbished lifter bar according to  claim 2 , wherein the additives include metal particles, ceramics or carbide. 
     
     
       4. The refurbished lifter bar according to  claim 1 , wherein the base member comprises a rail or profile that connects the refurbished lifter bar to the grinding mill. 
     
     
       5. The refurbished lifter bar according to  claim 4 , wherein the rail or profile is made from aluminium.